I would just ticket anyway. Without a fuel quote.
I would normally find out about it later and challenge it if I feel it's unjustified. Call centre agents/Customer Relations Executives can't issue binding YQ quotes, I had one quote me US$20 and it turns out to be closer to US$180.

The first quote should be right (from https://www.britishairways.com/trave...club/_gf/en_hk - CX ticketing will almost always get the same YQ + $50 security charge):



I won't even seek to confirm the misquoted booking to avoid confusion that I agreed to the overpriced YQ. I'll make a fresh booking and tell MPO to ticket it. Not that they can hold seats for more than a short period of time anyway.